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Finding the Fourth Proportional to 21,978.30, 30,330.03 and 11,906.77

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Solution

The fourth proportional to 21,978.30, 30,330.03 and 11,906.77 is: 16,431.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,978.30 : 30,330.03 = 11,906.77 : x
  2. Step 2: Convert to fraction form
    21,978.30/30,330.03 = 11,906.77/x
  3. Step 3: Cross multiply
    21,978.30x = 30,330.03 × 11,906.77
  4. Step 4: Simplify right side
    21,978.30x = 361,132,691.30
  5. Step 5: Solve for x
    x = 361,132,691.30/21,978.30
  6. Step 6: Final answer
    x = 16,431.33

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.